Question

What is the order decided by a processor or the CPU of a controller to execute an instruction?

(a) decode,fetch,execute

(b) execute,fetch,decode

(c) fetch,execute,decode

(d) fetch,decode,execute

I got this question by my college professor while I was bunking the class.

This key question is from Introduction to Microcontroller in section Microcontroller Basics of Microcontroller

Answer 1

Correct option is (d) fetch,decode,execute

Best explanation: First instruction is fetched from Program Memory. After fetching, instruction is decoded to generate control signals to perform the intended task. After decoding, instruction is executed and the complete intended task of that particular instruction.